<html>
    <head>
        <title></title>
        <!-- <script>
            alert('hello world!');
        </script> -->
    </head>
    <body>
        <ul id="myList">
            <li id="m1">首页</li>
            <li id="m2">企业介绍</li>
            <li id="m3">联系我们</li>
        </ul>
        <button onclick="alert('hello world!');">打印消息</button>
    </body>
    <script src="script.js"></script>
</html>